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The elephant's ears were as big as

The demand curve for steel to shift to the right

Explanation:

The question isn't complete. The full question can be found: https://www.chegg.com/homework-help/questions-and-answers/3-plastic-steel-substitutes-production-body-panels-certain-automobiles-price-plastic-incre-q31436687

Substitutes goods are goods that can be used in place of one another. If the price of plastic increases, consumers shift to steel, its demand increases and the supply curve shifts to the right.

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